Explanatory notes
… 2508.60 ‑ Mullite 2508.70 ‑ Chamotte or dinas earths This heading covers all natural clayey substances ( other … in the ceramic industry (bricks, building tiles, porcelain, china, earthenware, refractory bricks and other refractory … (2) Fuller’s earth , a natural earthy material with high absorptive power, composed chiefly of attapulgite. It …